A use-after-free flaw was found in the way samba servers handled certain SMB1 requests. An unauthenticated attacker could send specially-crafted SMB1 requests to cause the server to crash or execute arbitrary code.
Find out more about CVE-2017-14746 from the MITRE CVE dictionary dictionary and NIST NVD.
| CVSS3 Base Score | 6.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| Attack Vector | Adjacent Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Gluster 3.3 Samba on RHEL-7 (samba) | RHSA-2017:3261 | 2017-11-27 |
| Red Hat Enterprise Linux 6 (samba4) | RHSA-2017:3278 | 2017-11-29 |
| Red Hat Gluster 3.3 Samba on RHEL-6 (samba) | RHSA-2017:3261 | 2017-11-27 |
| Red Hat Enterprise Linux 7 (samba) | RHSA-2017:3260 | 2017-11-27 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | samba | Not affected |
| Red Hat Enterprise Linux 5 | samba | Not affected |
Prevent SMB1 access to the server by setting the parameter:
"server min protocol = SMB2"
to the [global] section of your smb.conf and restart smbd. This prevents and SMB1 access to the server. Note this could cause older clients to be unable to connect to the server.
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